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This gure shows a typical duct
system layout. Be sure the entire system
is properly sized to provide the correct
static pressure for optimum blower
performance. Have any new duct system
designed by a HVAC professional.
In order for your new furnace to function,
the controls must be properly adjusted.
The heat output is regulated by the
automatic draft control, on the bottom
door of the furnace. Refer to the illustrations at right; The electric draft motor (A)
opens and closes the apper door (B). The apper door opens to feed more air to
the re and closes to reduce the air to the re. The maximum air ow can be adjusted
by turning the adjuster bolt (C) counter-clockwise for more air and clockwise for less
air. NOTE: To preserve motor life, all adjustments of this bolt should be done while
the apper door is in the closed position. The idle adjuster (D) controls the minimum
amount of air that enters the rebox when the apper door is closed. Adjustment is
made by turning the adjuster vertical for zero air, or horizontal for maximum idle air.
It is best to start at a medium setting as shown at right.
Shut off the power at the circuit breaker before removing
the fan control cover. Make sure the copper jumper (circled below) is removed before
using the furnace. Note the three pointers on the dial. The one on the right is the high
limit adjustment. Pre-set at 200 degrees, it’s function is to close the automatic draft control
apper door if the temperature in the plenum reaches 200 degrees.
The center pointer adjusts the temperature at which the
blower starts. A good initial setting for this is 150 degrees. The
pointer on the left is to adjust the temperature at which the blower
stops. A good initial setting for this pointer is 100 to 110 degrees.
If it is set too low, the air will feel cool coming out of the registers
at the end of the blower cycle.
Set the thermostat to the desired temperature.
When more heat is needed, the thermostat opens the automatic
draft control apper door. This allows air into the rebox, which
raises the output of the re. When the temperature in the plenum
reaches the set temperature of the center pointer on the fan control,
the blower will begin blowing heated air through the ductwork.
When the thermostat reaches it’s setpoint, the automatic draft
control closes the apper door, thus, reducing the output of the
re. As the temperature in the plenum drops to the set point of the left pointer on the fan
control, the blower will stop. A solid fuel re cannot cease output immediately, therefore,
your room temperature may exceed the thermostat setting at times. You also may notice
times that the blower runs for a short period even though the draft control is closed.
Again, you can’t just stop a wood or coal re instantly, and temperature may build enough
to run the blower. This is normal and will be noticed more with coal than with wood.